A modified walkie-talkie batteries?

Source: 2020 - 03 - 25 20:07 hits: how modified walkie-talkie batteries? Working principle of the part 1, launch: phase-locked loop and the voltage controlled oscillator ( VCO) Launch radio frequency carrier signal, through the buffer inflation, motivation, power amplifier, generate additional rf power, through the antenna low-pass filter, restrain harmonic component, again through the antennas. Part 2, receiving: receive part of the future from the rf signal and the vibration signal from the PLL frequency synthesizer circuit at the top of the mixer mixing and generate at the top of the intermediate frequency signal. At the top of the intermediate frequency signal is crystal filter to eliminate further. After filtering, the intermediate frequency signal into intermediate frequency processing chip, and then mixed with the second oscillator signal, the second intermediate frequency signal. The second step is to use ceramic filter to intermediate frequency signal filtering, eliminate useless stray signals, then extend it and discriminator, produce the audio signal. Audio signal by reducing capacity, bandpass filter, circuit and so on, into the expansion and the volume control circuit and power amplifier, driver speakers, to acquire the information people need. 3, modulation signal and modulation circuit, converting the voice of the people through the microphone audio signals. 4, signal processing: the CPU CTCSS/CDCSS signal generated by extension and adjustment, enter the vco stop modulation. After receives the low frequency signal is obtained by frequency, part of the filter by extending and the audio frequency band pass filter to stop the plastic filter, into the CPU, comparing with the default values to stop, the result control audio amplifier and the output of the speaker. That is to say, assume that the default values are the same, then open the speakers, if the default value is different, you close the speaker. Walkie-talkie batteries, walkie-talkie batteries, there are many kinds and different, now generally is the nickel cadmium battery and lithium battery, battery condition and ability are also different, so the use of time should be more aware of battery maintenance and so on, now, many users to the walkie talkie battery usage is not very good, there are a variety of reasons, want to modify the project, such as walkie-talkie batteries, therefore, the following rebuilding and matters needing attention of walkie-talkie batteries, to you. Walkie-talkie walkie-talkie batteries conversion structure is very different, so the tk - here to doctors 2207 g as an example, explain walkie-talkie batteries modification information to us. Walkie-talkie over a period of time through the use of the future, you will find that the walkie talkie battery life is short, so the innovation of the walkie-talkie batteries is a very necessary job, switching cost is not high, the demand of the material is not difficult to find. First of all, the normal demand two pieces of mobile phone batteries, the demand for batteries, lithium-ion battery model is the best SL - 703 w - 703465, best to charging voltage is 4. Ability to 2 V, don't need too big, only 1600 mah, the battery can be found in mobile phone shop or repair shop, the price is in commonly 18 yuan, we need two pieces, so 36 yuan is enough. Intercom is a common battery, generally need to 6 - 5 rechargeable battery can work, the battery is very useless, but through transformation, the future will prepare 2 section in series with the battery plus diode and pressure sensitive resistance to stop the release and charging. This process is very simple, as long as the interphone shell open it, then take out the original battery, then it is ok to put the cell phone battery together. Later, put it in the walkie-talkie, with glue, is completed. Note walkie-talkie batteries of hypothesis to buy back the battery is a new battery, so should be full of three electricity stopped using in the future, once again, after the completion of the modified, should first test, shall not leak electricity, connect the power, and other conditions in stop operation cost, etc. The influence factors of system parameter 1) The transmitter output power is larger, the greater the coverage of transmitting, communication distance. But, the transmitted power can't be too big. If the transmission power is too big, not only consumes electricity, affect the service life of the amplifier components, also can cause contamination. Each country's radio administration of transmission power communication equipment are clearly defined. 2) The farther the more flexible receiver, communication distance. Environmental elements environmental factors mainly include road, the density of trees, electromagnetic interference environment, buildings, human activities, etc